RFR: JDK-8309870: Using -proc:full should be considered requesting explicit annotation processing

[Joe Darcy]

Address a small omission to the recent addition of "javac -proc:full", regard "-proc:full" as explicitly requesting annotation processing. Also add "-A" to the list of options indicating explicit annotation processing was requested.

The intention is to backport this bug fix to JDK 21 too.

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Commit messages:
 - JDK-8309870: Using -proc:full should be considered requesting explicit annotation processing

Changes: https://git.openjdk.org/jdk/pull/14423/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14423&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309870
  Stats: 10 lines in 2 files changed: 8 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/14423.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14423/head:pull/14423

PR: https://git.openjdk.org/jdk/pull/14423